. nuclear reactors. how the u.s. is trying to help keep things cool and why some who know nuclear reactors say there may be more happening than japan is letting on. >> their skills are needed at home, but tonight, members of a japanese search and rescue team are stranded in the bay area. what they were doing here in the first place. >>> and a little later despite all our faults. what happened there could not happen here. what makes quakes in the bay area a lot milder. >> turned out to be a nice day today, but storm clouds are around. what does that mean for the weekend? we'll talk about that coming up. ,,,,,,,, 8 point 9 earthqake... tonight the island nation faces >>> as japan attempts to recover from the massive earthquake, tonight the island nation is facing an even greater threat. a possible nuclear meltdown at three of the country's five plants. radiation levels are elevated and thousands of people have been evacuated, but is japan keeping a critical design flaw from the public? robert lyles talked with an expert. >> at the moment, i think they have a serious problem. >> when the c